| CHLORINATORS | • chlorinators n. Plural of chlorinator. • CHLORINATOR n. a machine for chlorinating. |
| CHRONOMETERS | • chronometers n. Plural of chronometer. • CHRONOMETER n. an instrument for measuring time. |
| COINHERITORS | • coinheritors n. Plural of coinheritor. • COINHERITOR n. a joint inheritor. |
| FORESHORTENS | • foreshortens v. Third-person singular simple present indicative form of foreshorten. • FORESHORTEN v. to shorten by proportionately contracting in the direction of depth so that an illusion of projection or extension in space is obtained. |
| NORTHERNMOST | • northernmost adj. Farthest north. • NORTHERNMOST adj. most northerly, also NORTHERMOST, NORTHMOST. |
| ORCHESTRIONS | • orchestrions n. Plural of orchestrion. • ORCHESTRION n. a name given to various keyboard or barrel organ instruments designed to imitate an orchestra, also ORCHESTRINA. |
| ORNITHOPTERS | • ornithopters n. Plural of ornithopter. • ORNITHOPTER n. a birdlike archaic flying machine. |
| ORNITHOSAURS | • ORNITHOSAUR n. a pterodactyl. |
| ORTHOCENTERS | • orthocenters n. Plural of orthocenter. • ORTHOCENTER n. the point of intersection of the altitudes of a triangle, also ORTHOCENTRE. |
| ORTHOCENTRES | • orthocentres n. Plural of orthocentre. • ORTHOCENTRE n. the point of intersection of the altitudes of a triangle, also ORTHOCENTER. |
| ORTHOPTERANS | • orthopterans n. Plural of orthopteran. • ORTHOPTERAN n. any member of the Orthoptera, an order of mandibulate insects, also ORTHOPTERON. |
| PROTHROMBINS | • prothrombins n. Plural of prothrombin. • PROTHROMBIN n. a protein-like substance present in blood plasma. |
| RHINOCEROTES | • rhinocerotes n. (Now rare) plural of rhinoceros. • rhinocerotes n. (Archaic) plural of rhinocerot. • rhinocerotes n. Plural of rhinocerote. |
| SYNCHROTRONS | • synchrotrons n. Plural of synchrotron. • SYNCHROTRON n. a type of very high-energy particle accelerator. |
| THYROTROPINS | • thyrotropins n. Plural of thyrotropin. • THYROTROPIN n. a hormone, produced in the anterior lobe of the pituitary gland, which stimulates the thyroid, also THYROTROPHIN. |
| TRICHLORFONS | • TRICHLORFON n. a crystalline compound used esp. as an insecticide, also TRICHLORPHON. |